Three smaller companies grabbed investors' attention on Tuesday, with unusually heavy trading volume after one landed a major government cleanup contract and two others reported quarterly results boosted by artificial intelligence demand.
Perma-Fix Environmental Services, a waste-treatment specialist, said it won a "master" subcontract from Hanford Tank Waste Operations & Closure to treat and dispose of pretreated liquid waste from the U.S. Department of Energy's Hanford Site in Washington state. The news sent the stock up about 16% on roughly triple its typical daily volume.
Meanwhile, Nebius and CoreWeave—two companies tied to AI infrastructure—jumped after their second-quarter earnings beat expectations, driven by strong demand for AI computing capacity.
What's behind the moves
Perma-Fix's win is a significant one. The Hanford Site is a massive, decades-old nuclear waste cleanup project, often described as one of the largest environmental remediation efforts in the world. Winning a subcontract there gives Perma-Fix a steady stream of work, which can be a meaningful revenue boost for a small-cap company.
For investors, the key takeaway is that government contracts like this can provide long-term visibility. Unlike one-off sales, cleanup work often spans years, giving companies a more predictable revenue base. That's why the market reacted so positively—it's not just a one-time pop, but potentially a recurring source of income.
On the AI side, Nebius and CoreWeave are part of the growing wave of companies building and operating data centers and cloud infrastructure for AI workloads. Their quarterly beats suggest that demand for AI computing power remains robust, even as some investors worry about a potential slowdown in tech spending.
Why small caps are in focus
These three names are all small-cap stocks, which tend to be more volatile than their larger counterparts. When a small company wins a big contract or beats earnings, the percentage move can be much larger than what you'd see in a mega-cap stock. That's part of the appeal—and the risk—of investing in this space.
Small-cap stocks have been a mixed bag this year. While some have rallied on hopes of interest rate cuts, others have struggled with higher borrowing costs and economic uncertainty. The recent moves in Perma-Fix, Nebius, and CoreWeave show that company-specific news can still drive outsized returns, regardless of the broader market backdrop.
For context, small business optimism has been climbing, with hiring plans jumping, according to a recent survey. That suggests smaller companies are feeling more confident, which could bode well for the sector overall. Small business optimism is on the rise, a positive sign for the broader economy.
What it means for investors
For everyday investors, these moves highlight the importance of diversification. Small-cap stocks can offer growth potential, but they also come with higher risk. A single contract win or earnings beat can send a stock soaring, but the flip side is that bad news can hit just as hard.
If you're considering small-cap exposure, it's worth remembering that these companies often have less liquidity and more volatility than large caps. That means you should be prepared for bigger swings in your portfolio. Small and mid-cap funds have been attracting inflows in some markets, reflecting investor appetite for this segment.
On the AI front, the strength at Nebius and CoreWeave suggests that the demand for AI infrastructure is not just a passing fad. Companies are still spending heavily on data centers and computing power, which could benefit a range of suppliers and service providers. Some experts argue that faster data links, not smaller chips, are the next frontier, which could open up new opportunities.
However, it's important to note that past performance is not a guarantee of future results. While these companies beat expectations this quarter, they still face challenges, including competition, regulatory scrutiny, and the cyclical nature of tech spending.
The bottom line
The trading action in Perma-Fix, Nebius, and CoreWeave is a reminder that small-cap stocks can be a source of outsized moves, both up and down. For investors, the key is to understand the specific drivers—in this case, a government contract and AI demand—and to consider how these fit into a diversified portfolio.
As always, it's wise to do your own research and consider your risk tolerance before making any investment decisions. Even in other sectors, Q2 results have shown mixed trends, so it's important to look at the fundamentals of each company.
